Allied-telesis AT-MR815T Manuel d'utilisateur télécharger pdf (Page 36)

Technical Specifications

Straight-through Wiring

If the twisted-pair link segment is to join two ports on a switch, and only one of

the ports has an internal crossover, the two pairs of wires must be straight-

through, as shown in Table 5.

Table 5: Straight-through RJ-45 Pin Assignments

Crossover Wiring

Two AT-MR415T/AT-MR815T Micro Repeaters can communicate only if the

transmitter on one unit is connected to the receiver on the other unit. This

reversal, or crossover function, can be implemented either in the wiring or in

the device itself. When connecting AT-MR415T/AT-MR815T Micro Repeaters,

a crossover must be implemented in the wiring. Refer to Table 6 for crossover

pin assignments.

Table 6: Crossover RJ-45 Pin Assignments

Hub Device

1 (TX+) 1 (TX+)

2 (TX-) 2 (TX-)

3 (RX+) 3 (RX+)

6 (RX-) 6 (RX-)

AT-MR420TR/MR820TR AT-MR420TR/MR820TR

1 (TX+) 3 (RX+)

2 (TX-) 6 (RX-)

3 (RX+) 1 (TX+)

6 (RX-) 2 (TX-)

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 51 52

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Allied-telesis AT-MR815T Manuel d'utilisateur Page 36